Picked up one of these for my Polo GTI (9N3) ... installed it as per instructions - seemed so simple all done in 10 minutes, only to find it doesn't seem to be detected by the head unit in the car - standard 9N3 fitment RCD200. Radio/CD work like normal, just not this interface 
What have I missed ? Do I need to pull a battery cable to reset the head unit to detect it ? Any help would be appreciated.

What have I missed ? Do I need to pull a battery cable to reset the head unit to detect it ? Any help would be appreciated.
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